WRC 297 Limitation on Dn/Tn ratio 1

[prajwalchelsea]

Hi all,

Nozzle load calculation as per WRC 297 always gives an error regarding the Dn/Tn ratio.
I know that the ratio is not within the limit mentioned in WRC 297, but practically to get that ratio is not possible in most of the cases.
Wanted to know if this limitation is mandatory or have to go for FEA analysis for such nozzles?

 

[gr2vessels]

As you mentioned, the WRC 297 is only applicable within the specified limits, then outside those limits another method should be employed, like PD 5500 Annex G (refer also to WRC 497 and/or Paulin FE107).
Cheers,
gr2vessels

 

[prajwalchelsea]

Tnk U for ur reply,
In that case most of the Nozzles cannot be designed as per WRC 297, as this ratio is not possible to achieve in most of the cases

Regards,
Prajwal

 

[LSThill]

prajwalchelsea (Mechanical)

additional information may help you

http://paulin.com/Downloads.html

Which WRC 107/297 Parameters Should I Check and When Is My Geometry Valid for a WRC/297 Analysis? (January 2008)

http://paulin.com/WEBfe107-1.pdf